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Crystalline high cis copolymer elastomer/styryl polymer composite material and its preparation method

A technology of styrene-based and composite materials, which is applied in the field of crystalline high-cis copolymer elastomer/styrene-based polymer composite materials and its preparation, can solve problems such as the decrease of tensile strength, improve low-temperature toughness, and improve resistance to Impact strength, effect of improving tensile strength

Active Publication Date: 2012-11-07
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, when elastomers are used to toughen styrene-based polymers, their tensile strength will decrease significantly, so it is extremely important to further improve the tensile strength while using elastomers to toughen styrene-based polymers

Method used

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  • Crystalline high cis copolymer elastomer/styryl polymer composite material and its preparation method
  • Crystalline high cis copolymer elastomer/styryl polymer composite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Under nitrogen protection, at 20°C, add 305mL of butadiene / styrene solution (Bd=32%mol) to a 1L dry polymerization bottle, add neodymium isooctanoate, Al(i-Bu) 3 , a rare earth catalyst solution of 2-ethylhexanoic acid, butadiene, ethanol and chloroform, wherein the molar ratio of each component is A: B: C: D: E: F=1: 16: 20: 1 : 0.6:1, the molar ratio of A to butadiene monomer is 1.6×10 -3 . After mixing evenly, polymerize at constant temperature for 5 hours, take a sample and stop the reaction with an ethanol solution of anti-aging agent 1076 with a mass concentration of 3%, and wash it with clean water. Dry in a vacuum oven at 50°C until constant weight. Butadiene polymerization conversion rate is 95%, its M w 1.0×10 5 ,M w / M n 2.6, cis-1, 4 content is 97.7%.

[0047] Afterwards, after raising the temperature to 60°C to continue the polymerization for 4.5h, sampling and testing, the M of the obtained block copolymer w 1.4×10 5 ,M w / M n is 3.2, and the st...

Embodiment 2

[0050] The synthesis of the block polymer (the first step and the second step) is the same as in Example 1, and the product index is the same as in Example 1.

[0051] In 99 g of the above-mentioned block polymer / styrene solution (polybutadiene content is 5% wt), add 0.20 mmol AIBN, and the polymerization and post-treatment process are the same as in Example 1. The styrene polymerization conversion rate was 86%. The M of the obtained crystalline high cis-butadiene copolymer elastomer / polystyrene in situ composite w 3.2×10 5,M w / M n 2.6, the content of styrene-butadiene copolymerized elastomer is 7.9%wt, the tensile strength is 24MPa, the elongation at break is 66%, the energy absorbed at break is 14MJ / m, and the impact strength is 8.8KJ / m 2 .

Embodiment 3

[0053] The synthesis of the block polymer (the first step and the second step) is the same as in Example 1, and the product index is the same as in Example 1. In 73g of the above block polymer / styrene solution (polybutadiene content is 9.0%wt), add 0.16mmol AIBN and mix evenly, the polymerization and post-treatment process are the same as in Example 1. The styrene polymerization conversion rate was 65%. The M of the obtained crystalline high cis-butadiene copolymer elastomer / polystyrene composite material w 2.8×10 5 ,M w / M n 2.9, the content of styrene-butadiene copolymerized elastomer is 17.9%wt, the tensile strength is 19MPa, the elongation at break is 93%, the energy absorbed at break is 15MJ / m, and the impact strength is 18.3KJ / m 2 .

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Abstract

The invention relates to a crystalline high cis copolymer elastomer / styryl polymer composite material and its preparation method. The crystalline copolymer elastomer in the composite material is a polystyrene and polyconjugated diene (such as butadiene and isoprene) segmented copolymer; the polystyrene chain segment has a certain crystallinity; and the content of cis-1,4 structure in the polyconjugated diene chain segment is greater than 95%. The styryl polymer is a copolymer of polystyrene or styrene and acrylonitrile. The preparation method of the composite material is a one-kettle three-step method, comprising the following steps of: adopting a composite catalyst of high-activity rare earth carboxylate to catalyze polymerization of conjugated diene in styrene, carrying out copolymerization on an obtained polymer and the styrene block so prepare a crystalline high cis segmented copolymer, and initiating free radical polymerization of styrene by the introduction of a radical initiator or by the adoption of a thermal initiation method so as to prepare the crystalline high cis copolymer elastomer / styryl polymer composite material. The weight average molecular weight (Mw) of the crystalline high cis copolymer elastomer / styryl polymer composite material is 2.0*105-3.8*105, and its molecular weight distribution index (Mw / Mn) is 2-4.

Description

Technical field: [0001] The invention relates to a crystalline high-cis copolymerized elastomer / styrene-based polymer composite material and a preparation method thereof. More specifically, it relates to a block copolymer of crystalline high-cis-conjugated diene and styrene and polystyrene or styrene / acrylonitrile copolymer to form an in-situ composite material, and by A method for preparing the composite material by combining the coordination polymerization method and the free radical polymerization method to realize the "one-pot three-step method". Background technique: [0002] Polystyrene (PS) is one of the five major plastics. Because of its advantages of easy processing, rigidity, dimensional stability and high transparency, it is widely used in food packaging, insulating sheets and home appliances. However, PS is very brittle and resistant to corrosion. impact, thus limiting its application in some high-end fields. In order to improve the brittleness of PS, a rubber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L25/06C08L25/12C08L53/02C08F297/06C08F112/08C08F212/10C08F4/54
Inventor 吴一弦周为为朱寒简睿徐日炜
Owner BEIJING UNIV OF CHEM TECH